长江三角洲典型小型养殖塘 NO 通量时空变化特征及其影响因素

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中图分类号：X16；X714 文献标志码：A 文章编号：1672-2043（2025）07-1930-13

doi：10.11654/jaes.2024-0711

Temporal andspatial variationsof N2O flux and their impactor factors in typical small aquaculture ponds in theYangtzeRiverDelta

HE Yang1，2 ，ZHANG Mi1，2* ，SHI Jie1²，WANGJiao³，XIEYanhong4，JIALei1²，XIAO Wei²，CAO Chang1， （1.NUSTCenterontmospericEnviroent，NanjigUniversityofIforationSienceandTechnoogyanjinga; 2.SchoololedeolUitfaiel MeteorologicalBureauofShaniProvince，TianO3Oo，Cina;4GuangiEologicalandEnviromentalonitoringentr，ang ，China）

Abstract：InthissdyNOfuesatthwateairintefcewereobsedbyulkdiusiomodelintpicalsallquacultueosin theYangtzeRiverDeltafrom May2017toMay2O21.ThetemporalandspatialvariationsofN2Ofluxandtheirimpactfactors were determined.TheresultsshowedthatNOfluxhaddiuralvariations withmaximumvalueinthenoonorafternoninthefourseasons.The diurnal variation ranges of NO flux were 11.20～117.28，30.96～150.30，3.77～22.77，4.73～21.74 μmol⋅m-2⋅d-1 in the four seasons， respectively. The N2O flux showed a seasonal variation. The value ranged from -0.97 to21 [7.83μmol⋅m-2⋅d-1 ，which was high insummer and low inwinter.The annual mean N2O flux was 34.86μmol⋅m-2⋅d-1 .Thediurnal variationsofN2O fluxwereaffectedbywind speed，air pressure，pHandoxidation-reductionpotential（ORP）.ThediuralvariationofNOfluxinsprig wasmainlycontrolledbyairpressure whichrespondedtoairpressurechangeliearlyThediualvariationofNOfluxinsummer，utumandwintereremainlydoinatedby windspeed，whichincreasedwithwindspedchangelinearlyTheseasonalvariationofNOemissionfluxwasafectedbywater temperature（2O cm depth），air temperature，air pressure， dissolved oxygen（DO）， pH and ORP. The main controlling factor was water temperature.The NzO flux increasedwith water temperature exponentially.The temperature sensitivity（ Q10 ）was2.36.Artificial management practicessuchasfeeding，aplicationofchicken manure，anddrainagecanmakeNOfluxincreasesignfcantly.NOfluxin theareawherechickenmanurewasappliedwasapproximately1.5times higherthanthatinfedingarea.Duringthedrainageperiod，I u2O fluxfrom drained pond was about 4 timeshigher than that fromundrained pond.

Keywords：aquaculture pond; bulk diffusion model; N2O flux; temporal and spatial variation; impact factor

近年来，人类活动的加剧导致大量的氮元素进入水生生态系统，水生生态系统成为 N2O 的排放热点[1-3]。（剩余23006字）